Get paid without the awkward chase
You are owed money, the reminder feels rude to send, so you put it off and the invoice quietly ages.
A collections chaser has not been run end to end yet. The parts it is built from are proven: jobs that run on a schedule, email sent in your name, and wording drafted with a model. Joining those into an overdue-invoice chaser, and connecting it to your accounting tool such as Xero or QuickBooks, is the build I would put together for you.
If this is the one costing you the most, that is where we would start. Twenty minutes to talk it through.